The running mate of Kenyan Prime Minister Raila Odinga, a frontrunner in the presidential race, alleged on Thursday that vote results had been “doctored”.

“We have evidence that the results we have received have been doctored,” outgoing vice president Kalonzo Musyoka told reporters, adding that in some cases “total votes cast exceeds the actual number of registered voters.”

But he also urged calm and stressed that his accusations about Monday’s elections were “not a call to mass action” and that the party was “committed to the principle of rule of law”.

“Because of these concerns, we as a coalition take the position that the national vote tallying process lacks integrity and has to be stopped,” Musyoka said.

Concerns have been raised at the widespread failure of a system under which the electoral commission had been broadcasting running tallies based on encrypted text messages received from polling stations.

Leaders have urged calm after hitches caused an electronic tallying system to stall, forcing the Independent Electoral and Boundaries Commission (IEBC) on Wednesday to start reading out results delivered in person by returning officers.